Triangle in which the g.f. for row n is [Sum_{k>=0} C(n+k-1,k)^3*x^k]*(1-x)^(3n+1), read by rows of k=0..2n terms.
A181544
Triangle in which the g.f. for row n is [Sum_{k>=0} C(n+k-1,k)^3*x^k]*(1-x)^(3n+1), read by rows of k=0..2n terms.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =1a(4) =1a(5) =20a(6) =48a(7) =20a(8) =1a(9) =1a(10) =54a(11) =405a(12) =760a(13) =405a(14) =54a(15) =1a(16) =1a(17) =112a(18) =1828a(19) =8464a(20) =13840a(21) =8464a(22) =1828a(23) =112a(24) =1a(25) =1a(26) =200a(27) =5925a(28) =52800a(29) =182700
External references
- oeis: A181544